test_update.py fails due to removed function

[jiblime]

Checklist

• I've verified that I'm running youtube-dlc version 2020.11.11-2 (2020-11.11-3?)
• I've searched the bugtracker for similar bug reports including closed ones

Verbose log

make offlinetest
[...]
ERROR: Failure: ImportError (cannot import name 'rsa_verify' from 'youtube_dlc.update' (../update.py))

Description

a915526#diff-4c90be6589d122f1a2c5f080f6c220ee54d822b6b13f9563ae649f6a7fd47a35L18
rsa_verify removed

test_updater.py stills calls for rsa_verify
https://github.com/blackjack4494/yt-dlc/blob/2020.11.11-3/test/test_update.py#L13
from youtube_dlc.update import rsa_verify